I went through the process for OW Dubai from Canada so happy to provide some perspective.
Post the numerical test, OW Dubai's recruitment process consists of three rounds.
For me the first two rounds were over the phone, conducted by Engagement Managers at the Firm. The format of these interviews is a mix of case and fit, with the case taking up the larger chunk of the interview.
The final round or "super day" is held at the Dubai office. OW would fly you in for a full day day of interviews. At this final round, I went through three rounds of interviewers: two Partner cases and one round with a Engagement Manager.
They usually get back to you with a decision either later that evening or the following day.
Hope that helps!